1. IEA World Energy Outlook 2008, 2009, and 2010
2. The network and research center list was assembled by S. Styring and P. Lindblad, Uppsala University, Sweden in the spring 2009
3. Review on Li–air batteries—Opportunities, limitations and perspective
4. The EU directive behind the so called 20/20/20 targets is found at: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32009L0028:EN: NOT
5. Porphyrin-Sensitized Solar Cells with Cobalt (II/III)–Based Redox Electrolyte Exceed 12 Percent Efficiency